Microphone base



FIG. 1 is a top perspective view showing the top, first side, and front of a microphone base;

FIG. 2 is a front view of the microphone base;

FIG. 3 is a rear view of the microphone base;

FIG. 4 is a first side view of the microphone base;

FIG. 5 is a second side view of the microphone base;

FIG. 6 is top view of the microphone base; and,

FIG. 7 is bottom view of the microphone base.

The broken lines in the drawings are for purposes of illustrating portions of the microphone base that form no part of the claimed design. 

CLAIM I claim the ornamental design for a microphone base, as shown and described. 